Values for the thermodynamic quantities (DeltaF, DeltaH, DeltaS) in reactions in which complexes of adenine nucleotides with magnesium ion (ATPMg(--), ADPMg(-), AMPMg) are formed have been obtained by a microcalorimetric technique by using an isothermic Calvet's apparatus. Experimental values measured at ionic strength mu = 0.2 indicate that complex formation reactions are driven by the entropic factor and that stability of complexes increases with length of the phosphate chain.
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Belaïch et al. (1969) studied this question.
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